5902 Bell 202 Modem
Contents
1. 47 Approvals and Certifications 49 Document Version 2 24 1 84 5 19 2011 3 Safety Information Index of Figures Figure 1 5902 Module Layout aaa 13 Figure 2 RS 232 Port Connector DGE ie tort 13 Figure 3 RS 232 Wiring 5902 DCE to 15 Figure 4 Four Wire mtu ee teo e ec mie ob Red oie e ad 17 Figure 5 Two Wire NOetWOFP cet ient oett 17 Figure 6 Four Wire RJ 45 Connection 18 Figure 7 Two Wire RJ 45 Connection 18 Figure 8 Four Wire Terminal Block Connection 19 Figure 9 Two Wire Terminal Block Connection 19 Figure 10 Typical Connection to Maxon Radio 21 Figure 11 Typical Connection to Johnson 21 Figure 12 Typical Connection to Motorola Radio 22 Figure 13 Transmit Timing with Soft Carrier 29 Figure 14 Receive Timing without Soft Carrier 30 Figure 15 Receive Timing with Soft Carrier Turn off 31 Document Version 2 24 1 84 5 19 2011 4 Safety Information Safety Information2. The receiving pair are connected to the and RX terminals Figure 4 Four Wire Network shows a typical 4 wire network Figure 6 Four Wire RJ 45 Connection and Figure 8 Four Wire Terminal Block Connection give wiring details Two wire operation uses one pair of wires for transmitting and receiving data The field wiring connects to the Tx Rx and Tx Rx terminals Figure 5 Two Wire Network shows a typical 2 wire network Figure 7 Two Wire RJ 45 Connection and Figure 9 Two Wire Terminal Block Connection give wiring details Document Version 2 24 1 84 5 19 2011 16 Installation MASTER RX TX SLAVE RX TX TX SLAVE TX SLAVE RX TX TX Figure 4 Four Wire Network MASTER Tx PK SLAVE TX Fx SLAVE Tx Rx SLAVE Tx PK Figure 5 Two Wire Network Document Version 2 24 1 84 5 19 2011 17 Installation RJ45 Modular ack 4 Wire Conections no connection no connection Rx Tx Tx Fx no connection no connection O1 8 D gt Tx pair to slaves Rx pair from daves Figure 6 Four Wire RJ 45 Connection RJ45 Modular Jack 2 Wire Connections no connection no connection no connection Tx Rx Tx Rx no connection no connection no connection O1 8 D
3. Figure 1 5902 Module Layout Field Wiring The 5902 modem has three connectors for field wiring The RS 232 port is wired to the DE 9S socket connector Refer to section RS 232 Serial Port for more information The modem wiring is terminated on either an 8 pole terminal block or an RJ 45 modular jack The terminal block is used for radios private lines and leased telephone lines The jack is used typically for telephone lines Refer to section Terminal Block and RJ 45 Modular Jack for more information The modem operates on radios two wire networks four wire multi point networks and four wire point to point networks Section Connecting to Dedicated Lines describes wiring networks on dedicated lines Section Connecting to a Radio describes wiring to radios RS 232 Serial Port 5 3 Gnd TD RD DCD 8 6 5V RIS DR Figure 2 RS 232 Port Connector DCE Document Version 2 24 1 84 5 19 2011 13 Installation The RS 232 port is a 9 pin female D sub miniature connector DE 9S configured as Data Communications Equipment DCE A maximum cable length of 50 feet 15 2 m is allowed Figure 2 RS 232 Port Connector DCE and the table below describe the RS 232 connector In the following table a MARK is a voltage of 3 volts or greater a SPACE is a voltage of 3 volts or less m wem 0 7 1 output This signal is at a MARK level when carrier is detected DCD by the modem
4. Tx Rx pair Figure 7 Two Wire RJ 45 Connection Document Version 2 24 1 84 5 19 2011 18 Installation 5902 Termination Block Rx KEY RCD Tx pair to daves Rx pair from daves Figure 8 Four Wire Terminal Block Connection 5902 Termination Block Rx KEY RCD Tx Rx pair Figure 9 Two Wire Terminal Block Connection Document Version 2 24 1 84 5 19 2011 19 Installation Connecting to a Radio There are four signals that are connected for radios These signals are described below Refer to the manual supplied with your radio for more information Wiring diagrams are provided for several common radios Call Control Microsystems if you require assistance in connecting a radio not described here Modem Transmitter Output The modem transmitter output connects to the radio transmitter audio input The modem is factory calibrated with the transmitter output at 0 dBm This level is too high for many radios It is necessary to reduce the modem output by adjusting the TX GAIN potentiometer see section Gain Adjustments The transmitter output can be reduced to a level radios can accept If additional attenuation is required an external resistor voltage divider may be used Modem Receiver Input The modem receiver input connects to the radio receiver data output The modem is factory calibrated with the receiver input set to detect signals as low
5. output to the receive RX input see below Using a computer or terminal on the DTE port transmit data to the modem The data should be echoed back by the modem The transmit output can be connected to the receive input in two ways e Select 2 wire operation to loop the signal back internally Close the 2 WIRE Switch and open the 4 WIRE switch This does not test the line isolation transformers e Select 4 wire operation to loop the signal back externally Open the 2 WIRE switch and close the 4 WIRE switch Connect the transmit TX output to the receive RX input with external wiring This tests the line isolation transformers If these tests indicate the modem is not operating correctly contact Control Microsystems for further assistance Document Version 2 24 1 84 5 19 2011 46 Specifications Specifications Modulation Data Rate Transmit Carrier Wires Transmit Level Receive Sensitivity Output Impedance Input Impedance Anti Streaming RTS CTS Delay CTS Hold Time Soft Carrier Tone Transmit Time Soft Carrier Tone Detect Delay Carrier Detect Delay Carrier Loss Delay Carrier Detect Level Disclaimer Control Microsystems reserves the right to change product specifications For more information visit www controlmicrosystems com Bell 202 Frequency Shift Keying FSK Mark 1200 Hz Space 2200 Hz Soft carrier turn off 900 Hz Frequency accuracy 0 4 1200 baud Switched o
6. 1 4 Detect RCD 2 Received mark _ data Sianal 5 Carrier Detect 2 8 Received Data Sequence of Operation Sender keys radio and begins transmitting carrier Carrier is received after radio key up and propagation delays Carrier detect delay starts timing at carrier reception Sender starts transmitting data after its RTS CTS delay Carrier Detect CD needs to be true before data reception CD goes false after expiration of carrier loss delay False character might be received here due to sudden carrier turnoff Figure 14 Receive Timing without Soft Carrier Turn off Document Version 2 24 1 84 5 19 2011 30 Operation RF Carrier 1 7 Detect RCD 4 2 Received Sianal Carrier Detect DCD Received Data Sequence of Operation Sender keys radio and begins transmitting carrier Carrier is received after radio key up and propagation delays Carrier detect delay starts timing at carrier reception Sender starts transmitting data after its RTS CTS delay Carrier Detect CD needs to be true before data reception CD goes false 4 10 ms after SCT tone starts Receiver is disabled No false data is received since receiver is disabled before carrier turnoff Figure 15 Receive Timing with Soft Carrier Turn off Sample Configurations This section describes sample configurations for different applications If the sample configurations do not work with your sy
7. Bell 202 modem Validity Notes This document is valid for all versions of the 5902 Bell 202 modem Product Related Information WARNING UNINTENDED EQUIPMENT OPERATION The application of this product requires expertise in the design and programming of control systems Only persons with such expertise should be allowed to program install alter and apply this product Follow all local and national safety codes and standards Failure to follow these instructions can result in death serious injury or equipment damage User Comments We welcome your comments about this document You can reach us by e mail at technicalsupport controlmicrosystems com Document Version 2 24 1 84 5 19 2011 8 Overview Overview The model 5902 Bell 202 modem converts RS 232 signal levels to audio tones for transmission over radios two wire networks four wire multi point networks and four wire point to point networks The modem is transformer isolated from the communication system so it is well suited to applications which may experience transients static discharges or high common mode voltages Radio communication is facilitated by an isolated radio transmitter key output and a radio frequency carrier detect input The input can be used to inhibit transmission if a radio signal is detected Each signal can be wired for active high or active low signals Configurable carrier detect and loss delays and RTS CTS de
8. Consult the description of RTS CTS handshaking for the product you wish to use In half duplex switched carrier operation the modem receiver is disabled during transmission This keeps the modem from receiving its own transmission on a two wire network In half duplex constant carrier operation the modem receiver is enabled This permits the constant carrier master modem to transmit data to slave modems even if one of the slave modems is simultaneously transmitting to the master The three timing diagrams below indicate the sequence of operations for receiving and transmitting data Document Version 2 24 1 84 5 19 2011 28 Operation 6 Transmit Mark SCT Sgnal tone tone Sequence of Operation CD DCD goes false 4 10 ms after receiving soft carrier turnoff tone asserts RTSto transmit data RTSis recognized when CD DCD is false Carrier isturned on and radio is keyed 1 10 ms after SCT reception stops CTSis asserted by modem after expiration of RTSCTS delay Data transmission starts CTSis held true by modem and carrier continues to be transmitted for CTShold time after last character is transmitted and RTSreturns to false Soft carrier turnoff tone is transmitted for SCT time Radio is de keyed and SCT tone is turned off Modem is ready for next reception or transmission Figure 13 Transmit Timing with Soft Carrier Turnoff Document Version 2 24 1 84 5 19 2011 29 Operation RF Carrier
9. Read these instructions carefully and look at the equipment to become familiar with the device before trying to install operate or maintain it The following special messages may appear throughout this documentation or on the equipment to warn of potential hazards or to call attention to information that clarifies or simplifies a procedure The addition of this symbol to a Danger or Warning safety label indicates that an electrical hazard exists which will result in personal injury if the instructions are not followed This is the safety alert symbol It is used to alert you to potential personal injury hazards Obey all safety messages that follow this symbol to avoid possible injury or death A DANGER DANGER indicates an imminently hazardous situation which if not avoided will result in death or serious injury A WARNING WARNING indicates a potentially hazardous situation which if not avoided can result in death or serious injury A CAUTION CAUTION indicates a potentially hazardous situation which if not avoided can result in minor or moderate CAUTION CAUTION used without the safety alert symbol indicates a potentially hazardous situation which if not avoided can result in equipment damage Document Version 2 24 1 84 5 19 2011 5 Safety Information PLEASE NOTE Electrical equipment should be installed operated serviced and maintained o
10. The modem recognizes the soft carrier turn off tone regardless of the SCT settings Reception of a soft carrier turn off tone ends reception within the soft carrier turn off delay time see Specifications The carrier loss delay is not used when a soft carrier turn off tone is detected The modem de asserts the DCD output and turns off the CD LED when the soft carrier turn off tone is received RTS will not be recognized until 1 to 10 ms after the tone ends Clear to Send Hold Time The CSH switch controls the time CTS is held asserted after RTS is de asserted There are two options Document Version 2 24 1 84 5 19 2011 25 Installation Radio Carrier Detect Duplex CTS HOLD TIME 1 ms CSH switch The modem holds the CTS signal asserted and transmits carrier marks after RTS is de asserted by the DTE De asserting RTS signals the end of a transmission This allows the DTE to transmit data with gaps between characters without causing the modem to go through RTS CTS delay timing on each gap Any gap longer than the CTS hold time signals the end of transmission The soft carrier turn off tone if any is generated after the conclusion of the CTS hold time The RCD switch selects the signals used to detect carrier There are two options The RCD switch also affects the length of the RTS CTS delay and the Carrier Detect delay Refer to section RTS CTS Delay and Carrier Detect Delay sections for details C
11. before it allows transmission in half duplex mode Therefore the carrier loss delay is also a transmission turnaround delay for half duplex mode Use With Constant Carrier Reception Use With Full Duplex In constant carrier half duplex HDX mode a carrier signal is continuously received on the receive pair Rx and Rx Selecting constant carrier reception mode allows the modem to transmit data on the transmit pair Tx Rx and Tx Rx even though received carrier is detected Close switches CLO and CL1 when connected to a constant carrier source in a four wire half duplex system The carrier loss delay always functions in full duplex mode see section Duplex The constant carrier option is not available since the modem can transmit at any time when in full duplex Effect of Soft Carrier Turn off Tones Anti Streaming Reception of a soft carrier turn off tone ends reception within the soft carrier turn off detect time see Specifications The carrier loss delay is not used The modem de asserts the DCD output and turns off the CD LED when the SCT tone is received ASO and 51 switches control the anti streaming option There are four settings ANTI STREAMING TIME ASO switch open closed open closed AS1 switch open open closed closed Document Version 2 24 1 84 5 19 2011 24 Installation The anti streaming time determines the maximum time a modem can continuously transmit This stops a DTE from
12. on the receiver inputs The CD led is on for a MARK level Pin 2 output Data received by the modem is output on this pin The RxD level is SPACE on standby and MARK for received data The RD LED is lit for a MARK level Pin 3 input Data transmitted by the modem is input on this pin from TxD the DTE The level is SPACE on standby and MARK for transmitted data The TD LED is lit for a MARK level Pin 4 input This signal indicates that the DTE is ready to receive DTR data It is not used by the modem Pin 5 This pin is connected to the system ground Ground Pin 6 output This signal indicates the modem is ready to start DSR communication It is in a MARK state Pin 7 input A MARK level is required for the modem to transmit RTS data The DTE should set it to a MARK just before transmission of data The CTS output will be asserted when the modem is ready to transmit data The RS LED is ON for a MARK level Pin 8 output This output indicates the modem is ready to transmit CTS data A MARK level indicates the modem is ready The DTE should wait for this signal before transmitting data The CS LED is on for a MARK level input This pin is connected to the power supply It is a output power source for an external device when used as an output It powers the modem when used as an input RS 232 wiring uses shielded cable The shield should be connected to chassis ground at one end of the cable only The DE 9 connector she
13. to anti streaming Either the anti streaming time period is too short for the message length or the DTE is not de asserting RTS at the end of each transmission Try increasing the anti streaming time or disabling it if necessary to correct this The DTE device configuration may need to be modified If the DTE does not provide RTS CTS control the F Option may be added to compensate DTE Transmits Too Soon after Receive The DTE device transmits a new message too soon after data is received The start of the message is lost because the receiving modem is not ready to receive Increase the carrier loss delay if soft carrier turn off is not used adjust CLO and CL1 The modem will not allow transmission until carrier is absent unless configured for constant carrier operation If soft carrier turn off is used increase the RTS CTS delay to transmit a pause between carrier start and data transmission CD LED On in Master Modem The carrier detect CD output of a constant carrier modem is on even though slave modems are not transmitting This is usually caused by crosstalk from the transmit pair to the receive pair The transmitted carrier is coupled into the receive wiring and is detected Although the constantly received carrier will not interfere with transmission it may interfere with reception from the slaves It also make it difficult to judge how effectively carrier is being received from the slave modems Reduce the modem rece
14. to it s original position The CD LED shows the status of the RCD input If the RCD input is true the CD LED will illuminate The KEY output is set to the same state as the KEY led A good way test the RCD input and KEY output is e Wire the KEY output to the RCD input e Toggle any configuration switch to cause the KEY LED and output to toggle e Observe that the RCD input LED is changes states when the KEY output LED changes state Document Version 2 24 1 84 5 19 2011 44 Maintenance To exit this test mode return the TST switch to the open position The modem will reconfigure itself according to the configuration switches and immediately begin operation Tone Transmission Test This test is used to continuously transmit alternating MARK and SPACE tones for aligning radio communication systems and adjusting modem transmit and receive signal levels This test mode will transmit tones continuously without anti streaming It is recommended the DTE be disconnected from the modem to stop reception of false data To select this test mode e Apply power to the modem e Open the FDX switch select half duplex mode e Close the TST switch Alternating MARK and SPACE tones are transmitted continuously Each tone lasts for approximately 2 5 seconds The KEY output is energized to put the radio if any into continuous transmit mode e This test may also be used to test the modem receiver During this test the modem is re
15. 44 mm deep Mounting Model 5902 7 5 x 35 DIN Model 5902SA desktop rubber feet Packaging Corrosion resistant zinc plated steel with black enamel paint Environment 5 RH to 95 RH non condensing 40 to 60 409 to 140 F Document Version 2 24 1 84 5 19 2011 48 Approvals and Certifications Approvals and Certifications Safety Non Incendive Electrical Equipment for Use in Class I Division 2 Groups A B C and D Hazardous Locations UL Listed to the following standards e CSA Std C22 2 No 213 1987 Hazardous Locations CSA Std C22 2 No 142 M1987 Process Control Equipment UL Std No 1604 Hazardous Classified Locations UL Std No 508 Industrial Control Equipment Document Version 2 24 1 84 5 19 2011 49
16. 5902 Bell 202 Modem Installation Operation and Maintenance Setup Manual 5 19 2011 Schneider Electric Safety Information The information provided in this documentation contains general descriptions and or technical characteristics of the performance of the products contained herein This documentation is not intended as a substitute for and is not to be used for determining suitability or reliability of these products for specific user applications It is the duty of any such user or integrator to perform the appropriate and complete risk analysis evaluation and testing of the products with respect to the relevant specific application or use thereof Neither Schneider Electric nor any of its affiliates or subsidiaries shall be responsible or liable for misuse of the information contained herein If you have any suggestions for improvements or amendments or have found errors in this publication please notify us No part of this document may be reproduced in any form or by any means electronic or mechanical including photocopying without express written permission of Schneider Electric All pertinent state regional and local safety regulations must be observed when installing and using this product For reasons of safety and to help ensure compliance with documented system data only the manufacturer should perform repairs to components When devices are used for applications with technical safety requirements the relevant
17. 5902 Bell 202T modem operates in full duplex on four wire networks or in half duplex on two or four wire networks and radios This section describes how these modes differ in operation When the modem is configured for full duplex a carrier is continuously transmitted and the receiver is continuously enabled This mode is usually used when two modems are connected back to back over a four wire network This mode is also used by a constant carrier master modem that communicates with multi dropped slave modems over a four wire network Full duplex or constant carrier operation requires a four wire network When the modem is configured for half duplex its transmitter is turned on only when the modem transmits data This mode is always used on two wire networks and radios Multi dropped slaves in a four wire network also use this mode A characteristic of half duplex is that the transmitter shuts off when the modem is not transmitting data This allows multiple modems to share a communication medium Half duplex operation requires that the DTE use RTS CTS handshaking When the DTE wishes to transmit data it asserts RTS and wait for the modem to assert CTS before transmitting data When the DTE has finished transmitting it de asserts RTS to allow the modem to return to the receiver enabled state This is not the RTS CTS handshaking method used by some personal computer communication software Some PC SCADA packages use this handshaking method
18. ARRIER AUDIO ONLY AUDIO AND RCD SOURCE INPUT RCD switch The modem hardware detects audio energy within specific frequency bands as a received carrier If the audio input is obtained from an unsquelched radio receiver the resulting noise causes false data reception The radio carrier detect option configures the modem to monitor the RCD radio frequency carrier detect input If RCD is used the modem detects carrier only when audio carrier tones are present and the RCD input is asserted If the RCD switch closed the RCD input needs to be connected to the radio s carrier detect output Otherwise the modem will never detect a received audio signal The RCD input signal is ignored in full duplex operation Refer to section Connecting to a Radio for details on wiring the RCD signal to a radio A true RCD signal will stop transmission in half duplex mode even if AUDIO ONLY is selected as the carrier detect source Therefore the RCD signal can be externally controlled to inhibit transmission If the RCD input signal is true the modem will not close the KEY output or transmit carrier This keeps the modem from transmitting over another radio transmission The FDX switch selects full or half duplex operation Document Version 2 24 1 84 5 19 2011 26 Installation DUPLEX HALF DUPLEX FULL DUPLEX FOX switch In full duplex mode the modem continuously transmits carrier This mode is suitable only for Two back to back
19. CT and CL delays Modem configuration switches are fully functional with the option module installed Supported Communication Parameters M Option The F option operates with any of the following word length and parity combinations Other combinations are not supported e 8data bits no parity e data bits with parity even odd mark or space The M option provides the model 5902 with special carrier detect control to improve communication when using the Modbus RTU protocol It is recommended for use with personal computer software packages which experience Modbus RTU protocol errors when a noise burst occurs at the end of data reception from an RTU The M option is recommended when using the 5902 modem by a personal computer to communicate with TeleSAFE VS 3 RTUs and TeleSAFE 6000 6000 16EX RTUs that use the model 6902 modem Neither the 6902 modem nor the TeleSAFE VS 3 modem provide soft carrier turn off Consequently a noise burst will often occur at the conclusion of each transmission from them The M option is not required when the modems in the communication system implement soft carrier turn off tones The soft carrier turn off tone stops carrier turn off noise Document Version 2 24 1 84 5 19 2011 41 Operation Carrier Turn Off and the Modbus RTU Protocol M Option Operation The Modbus RTU protocol determines when a message has been received by monitoring the time between the receipt of characters in the
20. KEY RCD 10 8 Volte Maxon D Connector datain data out PIT GND Voc CDS no connection no connection no connection Figure 10 Typical Connection to Maxon Radio 5902 Termination Block Rx KEY RCD bhnson Connector Pins 1 connection connection no connection connection 2 3 4 5 5 8 10 6 7 9 5 Keyline active low 8 9 1 Carrier Detect active high Dataln Ground 0 Data out hnson models 3410 3490 10 pin connector Figure 11 Typical Connection to Johnson Radio Document Version 2 24 1 84 5 19 2011 21 Installation 5902 Termination Block Motorola Connector Pins Not Used Not Used Not Used Mic Audio Input Channel Select Data Input DataOutput 6 7 8 14 3 19 9 Not Used 10 Not Used Connections shown for 11 Squelch Disable e Carrier detect active high Motorola RNet Series 12 Audio Output e PTT active low Telemetry Radio 13 Carrier Detect e Channel 1 enabled 15 pin D connector 14 PTT e Squelch enabled 15 Ground Figure 12 Typical Connection to Motorola Radio Configuration Switches RTS CTS Delay The 5902 modem has 16 configuration switches The
21. LAY RCD closed 67 ms CDO switch Open closed Open closed CD1 switch Open open Closed closed The modem will not receive data until carrier is detected The carrier detect period checks that a sustained carrier is present before the receiver is enabled The carrier detect delay stops noise from being received at the beginning of each reception The carrier needs to be present for this period before it is detected as carrier If the carrier drops out during the detect period it will not be detected as carrier The carrier detect delay switch settings need to be less than the RTS CTS delay of the transmitting modem plus any propagation delays such as radio transmitter and radio receiver attack times Document Version 2 24 1 84 5 19 2011 23 Installation Carrier Loss Delay The CLO and CL1 switches control the carrier loss delay There are four options The duplex FDX switch affects the selection of one option see section Duplex CL DELAY 39 ms FDX 1 5 ms Constant Carrier HDX CLO switch Open closed open closed CL1 switch Open open closed closed Carrier can be lost in the middle of a transmission especially with radio communication The carrier loss delay allows the carrier to disappear for brief intervals without the loss causing the modem to test for the carrier detect delay when the carrier reappears The carrier loss delay also determines how long the modem waits after reception terminates
22. S CTS delay by closing CSO and or CS1 You can also reduce the carrier detect delay by opening CLO and or CL1 in the receiving modem Bad Data after End of Message A garbage character appears after the end of a message with data before the character good If a garbage character appears after the end of a message use soft carrier turn off on the transmitter On a 5902 modem closing switches SCO and or SC1 If the receiver doesn t recognize soft carrier tones e g a model 6902 TeleSAFE modem or TeleSAFE VS 3 close and or SCO and or SC1 to transmit a quiet period after each transmission The noise burst will still occur but it will occur later in time after the end of the message A noise burst at the end of transmission is common and can be difficult or impossible to get rid of without the soft carrier turn off tone Missing End of Long Message The end of a long message is missing Short messages are received correctly This problem occurs when the transmitting modem s anti streaming time is too short Confirm this by observing the transmitting modem turn off the CD and KEY LEDs while the RS LED is still on Increase the anti streaming time or disable it if necessary to correct this Document Version 2 24 1 84 5 19 2011 38 Operation RS LED Always On All Other LEDs Off The modem seems to be unresponsive The RS LED is on but the CS and KEY LEDs are off This situation indicates the modem has shut off due
23. The equipment must also be installed using an acceptable method of connection The customer should be aware that the compliance with the above conditions may not prevent degradation of service in some situations Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier Any repairs or alternations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particularly important in rural areas CAUTION Users should not attempt to make such connections themselves but should contact the appropriate electric inspection authority or electrician as appropriate Document Version 2 24 1 84 5 19 2011 10 Industry Canada Certification AVIS L tiquette de l Industrie Canada identifie le mat riel homologu Cette tiquette certifie que le mat riel est conforme certaines normes de protection d exploitation et de s curit des r seaux de t l communications Industrie Canada n assure toutefois pas que le mat riel fonctionnera la satisfaction de l utilisateur Avant d installer ce mat riel l utilisateur doit s assurer qu i
24. and then reappears for a time period equal to the CD delay Therefore any noise character occurring after 33 milliseconds will not be received To make certain a carrier turn off noise character is rejected the transmitting modem should turn off its carrier no earlier than 35 milliseconds after the last character has been transmitted The default value for the S4 register transmit gap time in the TeleSAFE and TeleSAFE VS 3 is 8 characters 66 6 ms which is sufficient It is required that the received carrier actually disappear unless the modem is in half duplex constant carrier mode or the modem receiver will be permanently disabled For this reason the M Option is not recommended for both ends of a full duplex link Since carrier is not turned off the Option is not needed anyway The M Option is for use in a half duplex switched carrier or constant carrier system Document Version 2 24 1 84 5 19 2011 42 Maintenance Maintenance This module requires no routine maintenance If the module is not functioning correctly contact Control Microsystems Technical Support for more information and instructions for returning the module for repair Gain Adjustments The 5902 modem has two gain adjustments potentiometers There is one gain adjustment jumper Refer to the 5902 Module Layout figure for the locations of the adjustment potentiometers and jumpers Transmitter Adjustment The TX GAIN potentiometer R19 adjusts t
25. as 30dBm Radios provide output signals well above this level so no adjustment of the RX GAIN potentiometer should be necessary Key Output The KEY output is an optically isolated transistor which is used to turn on a radio transmitter It is referred to as a keyline or PTT push to talk signal in radio manuals When using the KEY output e Observe the polarity of the KEY output e Limit the output current to 25mA during the on condition e Limit the output voltage to 15 volts during the off condition The KEY output is on capable of conducting current during transmission of carrier tones and data Radio Carrier Detect Input The Radio Carrier Detect RCD input keeps the modem from keying a radio transmitter when RF carrier is detected This keeps one radio from transmitting over another It is highly recommended that radio applications make use of the RCD input The RCD input enables the modem receiver only when a radio frequency carrier is present when the RCD switch is closed This minimizes bad data caused by an unsquelched radio If a radio does not squelch its audio use of the RCD input is mandatory for communication Wiring Diagrams Wiring diagrams are provided for the following radios Refer to the manual supplied with your radio for more information Document Version 2 24 1 84 5 19 2011 20 Installation e Maxon DM 0500 e Johnson models 3410 3490 e Motorola RNet 5902 Termination Block Tx Rx Rx
26. cation system can cause false carrier detection which produces spurious garbage character reception Increase the carrier detect delay Decreasing the receive sensitivity by adjusting RX GAIN may also help if the signal to noise ratio is sufficient A high error rate with radio systems may indicate the audio output level is too high causing too strong a received signal The receive signal should be no higher than 10 dBm 2 45 V RMS if the receive gain has not been adjusted from the factory setting A receive signal of 0 dBm 775 mV RMS to 10 dBm 245 mV RMS is ideal For radio systems confirm that the output signal level matches the radio transmitter s requirements Some transmitters may require a very small signal Adjust the TX GAIN potentiometer and or use external resistors to attenuate the signal if necessary Modem Receives Data but doesn t Transmit The modem receives data without errors but doesn t transmit a reply If the transmitting modem is a constant carrier full duplex master the receiving modem is configured for constant carrier operation Check the carrier loss switch settings on the receiving modem On a 5902 modem the 50 and CS1 switches are both closed If the transmitting modem is not a constant carrier master it must be configured for half duplex operation Open the FDX switch on the transmitting modem Check that the transmitting DTE properly implements the RTS CTS handshake See the description for RTS On i
27. configured for full duplex operation The transmitter is looped back to the receiver e Select 2 wire operation to loop the signal back internally Close the 2 WIRE Switch and open the 4 WIRE switch This does not test the line isolation transformers e Select 4 wire operation to loop the signal back externally Open the 2 WIRE switch and close the 4 WIRE switch Connect the transmit TX output to the receive RX input with external wiring This tests the line isolation transformers During this test the CD LED will show the carrier detect status without any carrier detect or loss delays The RD LED is on and RxD outputs a MARK when a MARK tone is received If the modem output is looped back to the input the RD LED and RxD output should be on for approximately 2 5 seconds then off for 2 5 seconds Connect a break out box to the DTE port to observe the RxD signal To exit this test mode return the TST switch to the open position The modem will reconfigure itself according to the configuration switches and will immediately begin operation Full Duplex Loop Back Test This test confirms that the modem receiver transmitter and network wiring are functioning properly in a four wire full duplex point to point system To select this test mode Document Version 2 24 1 84 5 19 2011 45 Maintenance Troubleshooting e Apply power to the modem e Close the FDX switch select full duplex mode e Close the TST switch Any
28. data which received by the modem on the receive wire pair is re transmitted on the transmit wire pair Transmit any data from another modem Observe that the same data is echoed back During the test CD and DCD will indicate the carrier detect status without any carrier loss or carrier detect delays Soft carrier turn off tones will be ignored The CTS output will be de asserted to stop the DTE from transmitting The DTE will not receive any of the data which is being echoed To exit this test mode return the TST switch to the open position The modem will reconfigure itself according to the configuration switches and immediately begin operation The following procedure should be followed to isolate modem or communication systems First confirm the modem is functioning Perform the test procedure described in section Basic Functional Test This checks the modem CPU LEDs configuration switches the RCD input and the KEY output Second confirm that the modem transmitter and receiver are functioning e the modem is used in a full duplex application perform the test procedure described in section Full Duplex Loop Back Test e Togeta preliminary indication of proper operation in a half duplex application perform the test described in Tone Transmission Test e To test the modem by itself perform a local Loop Back test Configure the modem for full duplex four wire mode Place the TST switch in normal mode Connect the transmit TX
29. disabling a radio network or multi drop line by transmitting data continuously If the DTE transmits longer than the anti streaming time the modem turns off the KEY output and de asserts the CTS and DCD signals to the DTE The modem remains in this state until the DTE de asserts RTS The modem returns to normal operation once RTS is de asserted Anti streaming is active only when the modem is configured for half duplex operation It ignores anti streaming in full duplex operation Soft Carrier Turn off Switches SCO and SC1 control the length of the soft carrier turn off SCT tone There are four options SCT Tone Length No 1 ms Tone SCO switch open closed open closed SC1 switch open open closed closed The modem can transmit a soft carrier turn off SCT tone to inform receiving modems to turn off their receivers The tone is Sa at the end of a transmission It stops the receivers from detecting a noise burst at the conclusion of each transmission The tone can be disabled if the receiving modem does not recognize the SCT tone The modem de asserts the CTS signal when transmitting the SCT tone An asserted RTS signal will not be recognized until the SCT time has concluded Half duplex and two wire applications should use the shortest functional non zero SCT tone to get the quickest turn around time possible The modem will not transmit while the SCT tone is being received Soft Carrier Turn off Reception
30. e This position is recommended for radios that require low receive signal levels for proper operation Adjust the output level with the TX GAIN potentiometer Document Version 2 24 1 84 5 19 2011 43 Maintenance Receiver Adjustment The RX GAIN potentiometer R18 adjusts the receiver gain It has been factory adjusted for a carrier detect level of 30 dBm The potentiometer is set fully counter clockwise at the factory It may be adjusted by plus 10 dBm if necessary Modem Test Modes Switch and LED Test RCD and KEY Test The TST switch selects the modem test mode There are three basic tests provided as described below The TST switch is open for normal modem operation MODEM MODE NORMAL TEST Basic Functional Test This test checks that the modem CPU the configuration switches the CS and KEY LEDs the RCD input and the KEY output are functioning External wiring is required to test the RCD input and the KEY output Disconnect the modem from the DTE device and the communication system to stop interference during this test To select this test mode e Turn off the power to the modem e Close the TST switch e Apply power to the modem The CS and KEY LEDs will be on when power is applied The CS and KEY LEDs will toggle state when any configuration switch is toggled To test the configuration switches e Toggle switches on at a time e Observe that the CS and KEY LEDs toggle state e Return the switch
31. e removed If this is a telephone line system contact the telephone company If this is a direct wired system look for noise sources near the cable run Check that the cable shield is grounded at one end only If no garbage data is received RD LED off a modem on the network is continuously transmitting That modem is improperly configured for full duplex or its DTE device is continuously asserting RTS The 5902 modem has seven status LEDs The LEDs are powered by the communication or SCADA controller module through the I O bus The LEDs can be disabled to conserve power Refer to the controller manual for more information reo oor ronson TD clear The TD LED is on when the DTE is transmitting data to the modem clear The RD LED is on when space is being received by the modem CD The CD LED is on when received carrier is detected by the modem The CD LED status is affected by the carrier detection and loss delays and by the soft carrier turn off tone The CD LED status is the same as the DCD signal on the KEY RS 232 port The CS LED status is the same as the CTS signal on the RS 232 port The RS LED is on when the RTS signal on the RS 232 port is asserted It indicates the DTE wishes to transmit data The KEY LED is on when the KEY output is closed It indicates the modem is keying the radio to transmit data red The CS LED is on when the modem is ready to accept transmit data fr
32. ector to be removed Remove power before servicing unit To remove the connector e Pull the connector upward from the board Apply even pressure to both ends of the connector To install the connector e Line up the pins on the module with the holes in the connector Document Version 2 24 1 84 5 19 2011 15 Installation RJ 45 Modular Jack e Push the connector onto the pins Apply even pressure to both ends on the connector Refer to section Connecting to Dedicated Lines for wiring diagrams for typical networks Refer to section Connecting to a Radio for wiring diagrams for common radios Field wiring for telephone lines connects to the RJ 45 modular jack It mates with an 8 pin modular plug with at least 4 contacts This type of connector is common in the telephone industry e Pins 4 and 5 are the transmit pair for 4 wire mode and the transmit receive for 2 wire mode e Pins 3 and 6 are the receive pair for 4 wire mode Pins 1 2 7 and 8 are not used Refer to section Connecting to Dedicated Lines for wiring diagrams for typical networks Connecting to Dedicated Lines Four wire mode Two wire mode The 5902 modem operates in full duplex on four wire networks or in half duplex on two wire networks It uses leased telephone lines or private lines Four wire operation uses one pair of wires for transmitting data and a second pair for receiving data The transmitting pair are connected to the TX and
33. em I O Bus Refer to the System Configuration Guide at the beginning of this manual for complete information on system layout I O Bus cable routing and 5902 modem installation Connecting the Modem 5902 modem is normally connected to the SCADAPack 1 0 Bus through the I O Bus Connectors as shown in figure 1 In this configuration the SCADAPack provides a modem reset RST signal and a signal to enable the leds LEDON on the 5902 modem The 5902 modem is also available in a standalone SA configuration In this configuration the 5902 is not connected to a SCADAPack controller and the modem reset RST signal and a signal to enable the leds LEDON on the 5902 modem are not available Two jumpers J1 and J2 are included to enable these signals on the 59025 modem Figure 1 5902 Module Layout shows the location of the jumpers 5902 Modem e Remove jumper at J1 RST e Remove jumper at J2 LEDON 59025 Modem e Install jumper at J1 RST e Install jumper at J2 LEDON Document Version 2 24 1 84 5 19 2011 12 Installation o VO Bus Cilea Configuration Switches LEDON Jumper EX Gan TX Gain Jumper Adjustment RST Jumper TX Gain RI45 ack Adjustment __ Block RS232DCE Connector rd amp
34. for operation e Confirm that the CD LED is illuminated on both modems If it is not check that the transmit pair from each modem connects to the receive pair on the other modem If a CD LED flickers confirm that the other modem s transmit gain is normal see section Gain Adjustments and that the wiring is solid e Attempt to communicate The devices should communicate without errors If you need to slow down communication reconfigure your DTE for half duplex and lengthen the RTS CTS delay adjust the close CS0 and CS1 switches This inserts a pause before each transmission If your DTE does not support half duplex RTS CTS control you can use the F Option module This module provides RTS CTS handshaking for a full duplex DTE e Install the system in the field e Confirm that the CD LEDs on both modems are steadily illuminated If they are not the received signal is intermittent noisy or too weak Document Version 2 24 1 84 5 19 2011 34 Operation Half Duplex Multi Point Systems Unless noted otherwise switch settings apply to every modem Wire the system as it will be used in the field as described in section Field Wiring Set the 2W and 4W switches according to the number of wires used Set the FDX switch according to the system configuration you have chosen See the sample configurations above for suggestions Close the RCD switch if you are using the radio frequency carrier detect input Open the switch if yo
35. he transmit output level The range of adjustment is determined by the TX GAIN jumper J3 It permits an adjustment range of 0 dBm to 20 dBm or a range of 15 dBm to 35 dBm The transmit level is factory adjusted to 0 dBm This is the recommended level for telephone lines or hard wired installations The level may be reduced for use with radios or other systems requiring a lower output level We recommend the 5902 transmitter output level be maintained at its maximum level for the highest possible signal to noise ratio wherever possible Some radios require a lower input level Use the radio input level adjustment to adjust the signal where this is possible Where this is not possible lower the 5902 modem transmit level The transmit level is calibrated with a 600 ohm load If there is no load on the transmit output the level is 6 dB 2 times higher Thus the factory adjusted level is 6 dBm with no load Connect 600 ohm resistor across the output to lower the level by 6 dB 0 dBm to 20 dBm Range Install the TX GAIN jumper J3 in the bottom position 0 dBm to select the 0 dBm to 20dBm range This position is recommended for applications that require maximum signal levels for proper operation This is the factory default position Adjust the output level with the TX GAIN potentiometer 15 dBm to 35 dBm Range Install the TX GAIN jumper J3 in the top position 15 dBm to select the 15 dBm to 35 dBm rang
36. hen the RS 232 device does not implement the proper RTS CTS hardware handshake The RTS signal is on Therefore the modem transmits and cannot receive data Other modems won t transmit because carrier is present Document Version 2 24 1 84 5 19 2011 36 Operation High Error Rate The RTS CTS handshake is mandatory when using the modem with two wire networks or radios The DTE device configuration must be modified to correct this problem If the DTE device does provide RTS CTS control you can purchase the F Option for the model 5902 modem The F Option provides RTS CTS control if the DTE is not capable of providing it Data received by modems in a system are missing or corrupted at any point in a message Entire messages are sometimes lost There is no pattern in the location of the bad data A high error rate usually indicates a poor signal to noise ratio a weak signal that is too close to the carrier detect threshold or a signal which is far too strong A high error rate can also indicate interference especially with radio systems Telephone systems sometimes are noisier when the weather is poor Try to increase the signal level if it is low If multiple modems are connected to the same wiring it may be necessary to reduce the number of modems or to use conditioned lines If a radio system is used it may be necessary to increase the transmit power or change the modulation or antenna characteristics A very noisy communi
37. instructions must be followed Failure to use Schneider Electric software or approved software with our hardware products may result in injury harm or improper operating results Failure to observe this information can result in injury or equipment damage 2010 Schneider Electric All rights reserved Document Version 2 24 1 84 5 19 2011 2 Safety Information Table of Contents Safety Informationi iGaiata 5 About The BOOK ori nee ne 8 GIANG a er RAR in na er 8 e a E EE E E 9 Industry Canada Certification 10 LCS E Ej rfor ise pee 12 Connecting the Modem 12 Field Pr bete ein el 13 Connecting to Dedicated Lines 16 Connecting to a Radio ii 20 Configuration Switches nnns 22 quo ccn iii aiu iran oda Co Wu UAE ERN SOR SUE COR DR 28 Full D plex 2 n o one ER acsi 28 Half Duplex ie tae tope pete te Rte 28 Sample Configurations 31 System Configuration Procedures eene 34 Troubleshooting and Solutions 36 LEB Indicators eos erste eset tns A ioni e 40 ROLE PT RE 40 MBO 0 ela LS DL M iii ei e 41 43 Gain Adjusiments iii iaia aaa 43 Modem Test Modes 44 Tro bleshootirnig ia 46
38. ion increase the carrier loss delay by adjusting the CLO and CL1 switches If the CD LED flickers briefly on at the end of a transmission increase the carrier detect delay by adjusting the CDO and CD1 switches For maximum performance the carrier loss delays CL switches and carrier detect delays CD switches should be adjusted to the shortest time period which provides consistent communication Avoid a flickering CD LED Having Document Version 2 24 1 84 5 19 2011 35 Operation said this there is no point in increasing the carrier loss and carrier detect delays to stop a flickering CD LED if the cause of the flickering is low signal level or noise If the signal is too low or too noisy data errors will occur even though the CD LED seems steady e Attempt to communicate If there are errors further adjustments of the carrier detect and carrier loss delays are likely necessary If there are no communication errors you can attempt to speed up communication by reducing clear to send CSH hold soft carrier turn off SCT and RTS CTS delays as described below e You can attempt to speed up communication by reducing the clear to send CSH hold and soft carrier turn off SCT delays Open the CSH switch If the system still functions well open the SCO switch If it still functions well close the SCO switch and open the SC1 switch Typically systems need only the SCO switch closed You can try opening both the SCO and SC1 sw
39. itches Systems benefit from soft carrier turn off Use the shortest SCT time that provides consistent operation e You can attempt to speed up communication by reducing the RTS CTS delay Open the CSO switch It the system still works close the CSO switch and open the CS1 switch If is still works open both the CSO and CS1 switches e Now that the modem delays are properly adjusted you can add anti streaming protection If a DTE doesn t de assert RTS for whatever reason your communication system will be disabled until the anti streaming kicks in Anti streaming may interfere with long messages so use an anti streaming time you are comfortable with Observe the maximum transmission time Choose an anti streaming time longer than the maximum time If the maximum message time is close to the anti streaming time use the next larger anti streaming time setting This allows for variability in the message length Set the ASO and AS1 switches accordingly Troubleshooting and Solutions Communication using the Model 5902 Bell 202 modem is usually straightforward The following list shows conditions that can be encountered with possible solutions If you experience a condition which is not described below please contact Control Microsystems for technical support RTS On in Half Duplex The RTS input to the modem is on even though the DTE device is configured for half duplex operation No data is ever received by the modem This occurs w
40. ive sensitivity by adjusting the RX GAIN potentiometer Reducing the transmit level by adjusting the TX GAIN potentiometer may also work although this will reduce the signal being transmitted to the slave modems A very noisy line can cause this To determine if this is the case disconnect the transmit wire pair from the modem Check that none of the slave modems are continuously transmitting If the carrier persists the line is too noisy This can also be caused by trying to operate a full duplex constant carrier modem on a two wire network Full duplex constant carrier requires four wires Check that the 2 WIRE switch is open and the 4 WIRE switch is closed CD LED On in Radio System The CD LED is on or flickers indicating carrier received in a radio system An unsquelched radio receiver usually causes this It stops the modem from transmitting due to the presence of carrier and it causes a steady stream of garbage data to be received Document Version 2 24 1 84 5 19 2011 39 Operation Adjust the radio s squelch setting if it has one Use the radio frequency carrier detect RCD input on the modem so that carrier is ignored unless RF carrier is detected CD LED On in 2 Wire System LED Indicators F Option The CD LED is on or flickers indicating carrier received in a 2 wire system If garbage data is steadily received RD LED on the line is probably noisy The source of the noise needs to b
41. l est permis de le raccorder aux installations de l entreprise locale de t l communication Le mat riel doit galement tre install en suivant une m thod accept e de raccordement L abonn ne doit pas oublier qu il est possible que la conformit aux conditions nonc es ci dessus n emp chent pas la d gradation du service dans certaines situations Les r parations de mat riel homologu doivent tre effectu es par un centre d entretien canadien autoris d sign par le fournisseur La compagnie de t l communications peut demander l utilisateur de d brancher un appareil la suite de r parations ou de modifications effectu es par l utilisateur ou a cause de mauvais fonctionnement Pour sa propre protection l utilisateur doit s assurer que tous les fils de mise la terre de la source d nergie lectrique les lignes t l phoniques et les canalisations d eau m talliques s il y en a sont raccord s ensemble Cette pr caution est particuli rement importante dans les r gions rurales AVERTISSEMENT L utilisateur ne doit pas tenter de faire ces raccordements lui m me il doit avoir recours un service d inspection des installations lectriques ou un lectricien selon le cas Document Version 2 24 1 84 5 19 2011 11 Installation Installation The installation of the 5902 modem requires mounting the modem on the 7 5mm by 35mm DIN and connecting the 5902 modem to the syst
42. lays provide high quality communication in a broad variety of environments The anti streaming timer keeps a continuously keyed modem from swamping the communication system Configuration switches permit adjustment of carrier detection and loss delays anti streaming time soft carrier turn off tones RTS CTS handshake timing and full half duplex selection Self test and adjustment modes facilitate field maintenance Two package versions are available The model 5902 modem is a DIN rail mounted version for SCADAPack controllers The model 590284 is a desktop version for with personal computers and other RS 232 equipment This manual covers the 5902 modem Document Version 2 24 1 84 5 19 2011 9 Industry Canada Certification Industry Canada Certification The model 5902 modem is registered with Industry Canada as complying with standard CS02 The certification number is on a sticker attached to the unit Industry Canada requires that the following information be conveyed to the user NOTICE The Industry Canada label identifies certified equipment This certification means that the equipment meets certain telecommunications network protective operational and safety requirements Industry Canada does not guarantee the equipment will operate to the user s satisfaction Before installing this equipment users should ensure that it is permissible to be connected to the facilities of the local telecommunications company
43. ll is a good ground point Improperly shielded cables may result in the installation not complying with FCC or DOC radio interference regulations The 5902 modem is connected typically to a DTE device Figure 3 RS 232 Wiring 5902 DCE to DTE shows a typical connection Document Version 2 24 1 84 5 19 2011 14 Installation Terminal Block The serial cable that is provided with the 5902 modem is suitable for connecting the modem to Data Communication Equipment DCE device DTE 5902 DCE TxD DTR GND s gt RTS CTS J 0J Pin 9 is a connected to the 5 Volt 5 Volt power supply See device specifications for nin numbers Figure 3 RS 232 Wiring 5902 DCE to DTE Field wiring for radios and dedicated lines connects to the terminal block It has 8 poles e Poles 1 and 2 are the transmit pair for 4 wire mode and the transmit receive for 2 wire mode Poles 3 and 4 are the receive pair for 4 wire mode e Poles 5 and 6 are the radio key output Poles 7 8 are the radio carrier detect input Controller modem and modules use screw termination style connectors for termination of field wiring They accommodate solid or stranded wires from 22 to 12 AWG The connectors are removable This allows module replacement without disturbing the field wiring Leave enough slack in the wiring for the conn
44. message If 3 5 character times elapse without a new character a message is assumed to be complete At 1200 baud messages are assumed to be complete 29 2 milliseconds after the last character is received Carrier turn off without soft carrier turn off often results in the receipt of a noise character A noise character occurring within the framing interval will corrupt the preceding message since the character is assumed to be part of the message If a noise character is received after the 29 2 millisecond framing interval the preceding message will not be affected but the character itself may be interpreted as a new Modbus message The M option provides additional carrier detection control to minimize noise characters and check that Modbus RTU framing is respected The M option affects operation of the model 5902 modem by modifying the clear to send hold time and the carrier loss delay Clear to Send Hold Time Carrier Loss Time The clear to send hold time is 50 milliseconds This keeps the transmitted carrier from turning off until 50 milliseconds after the last data character is transmitted If a noise character results it will occur sufficiently past the end of the Modbus RTU message that the message will not be corrupted The modem receiver is disabled 33 milliseconds after the last data bit received by the modem The modem receiver remains disabled until the received carrier disappears for a time period equal to the CL delay
45. modems on a four wire network A master modem on a multi dropped four wire network which connects to half duplex constant carrier slave modems In full duplex mode the modem ignores the state of the RTS signal although the RTS CTS delay is still active The carrier detect and carrier loss delays are active Anti streaming is ignored The soft carrier turn off tone will not be transmitted although it will be recognized if received Radio carrier detect is ignored Constant Carrier Networks Constant carrier operation is often used with multi point networks A full duplex master modem connects to multi dropped half duplex slave modems The master modem always transmits a carrier which is why the system is known as a constant carrier network The main benefits are faster operation the slave modems do not experience any carrier detect or loss delays and instant detection of communication system failure by loss of carrier This type of network requires four wires The slave modems must be configured for half duplex constant carrier reception Otherwise they will be unable to transmit data See section Carrier Loss Delay for details on configuring a 5902 modem for constant carrier reception Test Mode Selection The TST switch selects the test mode Refer to section Modem Test Modes for more information Document Version 2 24 1 84 5 19 2011 27 Operation Operation Full Duplex Half Duplex Timing Diagrams The
46. n Half Duplex for more information Document Version 2 24 1 84 5 19 2011 37 Operation Other Modems Not Receiving Data The modem transmits data but no data are received at the other end This can occur if a four wire system is not wired correctly Check that the transmit signal output is connected to the receive input on the other end Check that all modems have the 4 WIRE switch closed and the 2 WIRE switch open to select four wire mode This can occur with very short messages if the transmitter s RTS CTS delay is too short It is possible that the entire message might be transmitted in less than the receiver s carrier detect delay time Increase the RTS CTS delay on the transmitter If this does not work decrease the carrier detect delay on the receiver This can occur is the signal level is too low Check the level by putting the modem into the tone transmission test mode see section Modem Test Modes The receiving modem s CD LED should be on and its RX LED should blink as data is received If necessary adjust the modem transmit level TX GAIN to get a steady CD at the receiving modems On rare occasions it may be necessary to adjust the receiver sensitivity RX GAIN of the receiving modems Bad Data at Start of Message There are missing or corrupted characters at the beginning of a message The rest of the message is good If the first part of the received data is missing or garbled increase the transmitter s RT
47. nd synchronize to the carrier before it can accept data Radios may take some time to key up to rated power before transmitting Radio repeaters also require time to engage The RTS CTS delay provides this time When RTS is asserted by the DTE the 5902 modem closes the KEY output turns on the transmit carrier and starts the delay When the delay has expired the modem asserts CTS to allow the DTE to transmit The modem will not transmit carrier or start the RTS CTS delay while carrier is being received unless constant carrier operation is selected refer to section Carrier Loss Delay This keeps the modem from transmitting at the same time as another modem Full Duplex FDX closed The RTS CTS delay has no effect on modem operation in full duplex mode The modem continuously transmits a carrier The RTS CTS delay is functional and can be used to insert a pause between transmissions To use this feature the DTE device uses RTS CTS handshaking half duplex operation When the DTE is ready to transmit data it asserts RTS and waits for CTS to be asserted by the modem When CTS is asserted the DTE transmits the data The DTE releases RTS at the end of transmission This causes a pause before each transmission Carrier Detect Delay The CDO and CD1 switches control the carrier detect delay There are four options The delays are longer when the RCD option is enabled as radios usually require longer delays DELAY RCD open 30 ms DE
48. nly by qualified personnel No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material A qualified person is one who has skills and knowledge related to the construction and operation of electrical equipment and the installation and has received safety training to recognize and avoid the hazards involved BEFORE YOU BEGIN Do not use this product on machinery lacking effective point of operation guarding Lack of effective point of operation guarding on a machine can result in serious injury to the operator of that machine CAUTION EQUIPMENT OPERATION HAZARD Verify that all installation and set up procedures have been completed Before operational tests are performed remove all blocks or other temporary holding means used for shipment from all component devices Remove tools meters and debris from equipment Failure to follow these instructions can result in injury or equipment damage Follow all start up tests recommended in the equipment documentation Store all equipment documentation for future references Software testing must be done in both simulated and real environments Verify that the completed system is free from all short circuits and grounds except those grounds installed according to local regulations according to the National Electrical Code in the U S A for instance If high potential voltage testing is necessary follow recommendatio
49. ns in equipment documentation to prevent accidental equipment damage Before energizing equipment Remove tools meters and debris from equipment e Close the equipment enclosure door e Remove ground from incoming power lines e Perform all start up tests recommended by the manufacturer OPERATION AND ADJUSTMENTS The following precautions are from the NEMA Standards Publication ICS 7 1 1995 English version prevails Document Version 2 24 1 84 5 19 2011 6 Safety Information e Regardless of the care exercised in the design and manufacture of equipment or in the selection and ratings of components there are hazards that can be encountered if such equipment is improperly operated e Itis sometimes possible to misadjust the equipment and thus produce unsatisfactory or unsafe operation Always use the manufacturer s instructions as a guide for functional adjustments Personnel who have access to these adjustments should be familiar with the equipment manufacturer s instructions and the machinery used with the electrical equipment e Only those operational adjustments actually required by the operator should be accessible to the operator Access to other controls should be restricted to prevent unauthorized changes in operating characteristics Document Version 2 24 1 84 5 19 2011 7 About The Book About The Book At a Glance Document Scope This manual describes operation and maintenance of the 5902
50. oise at the beginning of each reception Check that the RTS CTS delay on slave modems is longer than this delay Full duplex is selected Half Duplex Slave for Constant Carrier Master Use this configuration for a slave modem connected to a full duplex constant carrier master modem see above Switches not shown in the table below are either ignored Constant carrier half duplex operation should not be selected if two wire mode is used Adjust these switches to transmit a longer carrier before data transmission commences Check that this delay is longer than the master modem s CD delay plus any propagation delays in the communication system closed These switches are closed for constant carrier closed reception adjust Add anti streaming as required The maximum message length determines anti streaming time closed Use the shortest SCT time that stops carrier open turn off noise This will normally be achieved with the recommended settings The SCT time can also be used to transmit a quiet period at the end of each message if the receiving modem does not recognize soft carrier turn off Document Version 2 24 1 84 5 19 2011 32 Operation SWITCH SETTING COMMENTS Close CSH if the RTS signal on the DTE flickers Also close CSH to transmit an extended MARK after each transmission Half duplex is selected Close switch to engage tone transmission test Half Duplex Master Or Slave Use this configu
51. om the DTE The F option module allows the model 5902 modem to operate with DTE devices not implementing the proper RTS CTS hardware handshake This includes Document Version 2 24 1 84 5 19 2011 40 Operation personal computer SCADA software and many programmable controllers The F option allows these devices to communicate over two wire systems multi point four wire systems and radios The F option module is a data buffer that stores up to 64 characters received from the DTE The data buffer provides the RTS CTS handshake to the modem When characters have been received into the buffer the RTS signal is asserted to request transmission When the modem asserts the CTS signal the characters are transmitted from the buffer The F option module continuously asserts the CTS and DSR signals to the DTE It ignores the RTS and DTR signals from the DTE The DCD signal to the DTE follows the state of the CD LED This means the DTE can use a three wire RS 232 interface consisting of TxD RxD and ground No other signals are necessary The buffer capacity of 64 bytes allows the model 5902 to receive approximately 0 5 seconds of data transmission from the DTE before the data needs to be transmitted Provided the DTE does not transmit more than 64 characters when the modem is incapable of re transmitting them e g while the modem is receiving data the buffer capacity is adequate for every combinations of RTS CTS except 1000 ms CSH S
52. r constant full or half half duplex requires DTE to implement hardware RTS CTS handshake two or four 35 dBm to 0 dBm into 600 ohms potentiometer adjustable 30 dBm to 3 dBm potentiometer adjustable to 40 dBm 600 ohm balanced transformer isolated 600 ohm balanced transformer isolated none 10Sec 30Sec 60Sec wire 25ms 50ms 125ms 250ms radio 67ms 133ms 266ms 1000ms 1ms 8ms none 13ms 25ms 38ms 4ms to 10ms wire 19ms 30ms 51ms 92ms radio 33ms 67ms 133ms 265ms 6ms 10ms 23ms 39ms constant carrier reception half duplex 30 dBm adjustable from 20 dBm to 40 dBm Document Version 2 24 1 84 5 19 2011 47 Specifications Radio Frequency optical coupler LED input Carrier Detect 5 VDC at 1mA Input 12 VDC at 3mA 24 VDC at 7mA Radio Carrier use or ignore Input Mode Radio Transmit optical coupler open collector transistor Key Output 5 to 15 VDC 25mA Visual Indicators Transmitted data LED Received data LED Clear to Send LED Request to Send LED Carrier Detect LED Radio key output LED Test Modes Full duplex Loop Back Half duplex test pattern transmission Self diagnostic test Power Model 5902 5V at 60mA Requirements Model 5902SA 115 VAC at10 VA 9V 500mA AC adapter Model 59025 9V min 12V max Field 8 pole removable terminal block Termination 12 to 22 AWG 15 amp contacis RJ 45 modular jack Dimensions 4 25 inch 108 mm wide 4 625 inch 118 mm high 1 75 inch
53. ration to connect two or modems on a two or four wire network The transmission of any modem will be received by all other modems on the network when using a two wire connection or radios This is the basic configuration of a typical radio network Use the settings below to establish communication The settings can be tuned for faster operation once communication is established See the comments below for suggestions When optimizing adjust one setting at a time and observe the effect before proceeding SWITCH SETTING COMMENTS closed Adjust these switches to transmit a shorter closed carrier before data transmission commences Check that this delay is longer than the receiving modems CD delay plus any propagation delays in the communication system open Adjust these switches for a longer delay to stop open noise at the beginning of each reception Ensure that the transmitting modem s RTS CTS delay is longer than this CD delay plus any propagation delays open Adjust these switches for a shorter delay once closed communication works If the received signal is weak or the CD led flickers off restore this setting Carrier loss delay will not stop data loss but can stop a jittery DCD signal adjust Add anti streaming as required The maximum transmission length determines the anti streaming time closed Use the shortest SCT time that stops carrier closed turn off noise The SCT time can also be used to transmit a q
54. stem check section Troubleshooting and Solutions or use the general configuration procedures in section System Configuration Procedures Refer to sections Connecting to Dedicated Lines and Connecting to a Radio sections for wiring details Full Duplex Back to Back Modems Use this configuration to connect two modems over a four wire network Switches not shown in the table below are either ignored or are not critical SWITCH SETTING COMMENTS Open Adjust these switches for a longer delay to Open pause before each transmission The DTE needs to be configured for half duplex with RTS CTS handshaking to use this feature Full duplex is selected oh Close switch to engage loop back test Document Version 2 24 1 84 5 19 2011 31 Operation Full Duplex Constant Carrier Master Use this configuration for a master modem connected to one or more slave modems on a multi dropped four wire network This configuration is essentially a full duplex modem except that the carrier detect and carrier loss delays need adjustment since the slave transmitters are turning on and off Switches not shown in the table below are ignored SWITCH SETTING COMMENTS 50 RTS CTS delay creates pause before CS1 Open each transmission Adjust these switches to lengthen the delay The DTE must implement proper half duplex RTS CTS handshaking to use this feature Open Adjust these switches for a longer delay to Open reduce n
55. u are not Close switches CSO CS1 SCO SC1 and Close switches CLO and CL1 if the modem is used for constant carrier reception Open the remaining switches Turn on the system and attempt to communicate Observe the CD LED on receiving modems It should illuminate when the transmitting modem s KEY LED is illuminated This indicates that the receiving modem hears the transmitting modem s carrier If the CD LED does not illuminate try the following and repeat this step Confirm that the wiring is correct and that the transmit signal from the transmitting modem is connected to the receive signal wiring on the receiving modem or modems One of the easiest ways to test the communication path is to temporarily put the transmitting modem into full duplex by closing the FDX switch Receiving modems should have a continuously illuminated CD LED If the system uses radios confirm that all radios are using the same frequency Try adjusting the squelch level on the receiving modem Observe the CD LED on receiving modems The LED should turn on solidly when carrier is received and turn off solidly when the transmitting modem turns off its KEY LED If the CD LED flickers off during reception check the signal level and wiring If the CD LED flickers on randomly you have a noisy communication channel You will receive garbage data Try adjusting the squelch level if using radios If the CD LED briefly flickers on at the end of a recept
56. uiet period at the end of each message if the receiving modem does not recognize soft carrier turn off Document Version 2 24 1 84 5 19 2011 33 Operation SWITCH SETTING COMMENTS close Open CSH switch to shorten carrier transmission after data is sent See also SCT switches above Carrier extension equals SCT delay plus CSH delay adjust Open if RF carrier detect input is not used Close if RF carrier detect input is used open Close switch to engage half duplex tone transmission test System Configuration Procedures Half duplex is selected Use the configuration procedures below to help get a new communication system installed and functional There is a procedure for point to point systems and for multi drop systems The recommended place to start with a new communication system is on a workbench or desk in an office We recommend you test the basic elements of the system before field installation Full Duplex Point to Point Systems Unless noted otherwise switch settings apply to both modems e Wire both modems using four wires as described in section Field Wiring e Open all switches on both modems Close the FDX 4W switches on both modems e Turn on power to the system Observe that the KEY LED is illuminated on both modems indicating that they are transmitting carrier If is it not confirm that the FDX switch is closed and that power is applied Check that theKEY LED is illuminated on both modems
57. y specify the modem communication parameters and operating modes See Figure 1 5902 Module Layout for switch locations The functions are described in detail below The switches can be changed with the power applied All changes take effect immediately e To CLOSE a switch press down on the right side of the switch e OPEN a switch press down on the left side of the switch Using a pencil mechanical pencil or pen to adjust the switches as graphite and ink can affect the switch A paper clip is a good tool for adjusting switches The CSO and CS1 switches control the RTS CTS delay There are four options The delays are longer when the RCD option is enabled as radios usually require longer delays DELAY RCD open 25 ms 250 ms DELAY RCD closed 67 ms 1000 ms 50 switch open closed open closed CS1 switch open open closed closed The RTS and CTS signals coordinate data transmission between the modem and the DTE When RTS is asserted by the DTE the modem turns on its carrier keys the radio and starts a delay At the conclusion of the delay CTS is asserted by the modem to allow the DTE to transmit data This delay has different functions according to the modem duplex setting Document Version 2 24 1 84 5 19 2011 22 Installation Half Duplex FDX open The RTS CTS delay allows the modem carrier to be transmitted to and be detected by the receiving modem or modems The receiving modem requires time to detect a
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